. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. So. Calik. Ac.\i)i;my oi- S'ciencks Vol. 49. Part 2, 1950 sac in adult Aini)hiuina. 7. C'liiof nerves am! cntciinjj: and leaving;' l)l()od vessels in the saccular region of Siren. 14 l-(). Dissections of membranous labyrinth of Triturus. 1. Side view of membranous capsule of a i) mm. unhatched embryo. 2. Top view of a 12 mm. just hatched larva, view from above. It is really one sac but partly divided. Mesial side to the rip^ht. The utricu- lus on this side. mm. larva, v
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. So. Calik. Ac.\i)i;my oi- S'ciencks Vol. 49. Part 2, 1950 sac in adult Aini)hiuina. 7. C'liiof nerves am! cntciinjj: and leaving;' l)l()od vessels in the saccular region of Siren. 14 l-(). Dissections of membranous labyrinth of Triturus. 1. Side view of membranous capsule of a i) mm. unhatched embryo. 2. Top view of a 12 mm. just hatched larva, view from above. It is really one sac but partly divided. Mesial side to the rip^ht. The utricu- lus on this side. mm. larva, view from above utriculus at the rif^ht with sup??estions of semi-circular canals. 4. Mesial view of the last, showing sacculus below, ductus endolymphaticus with utriculus arched above. 5 and 6. Similar views of a 14 mm. larva. Line equals 1 mm. 7. Section of wall of membranous labyrinth; cuboidal lining cells, basement membrane, small blood vessel with a blood corpuscle and connective tissue cell 8. Section of the wall of ductus endolymphaticus in adult. Scale for 7 and 8 equals one hundredth mm. 9. Longitudinal section through pars neglecta, ductus perilymphati- cus and at the bottom pars basilaris. 10. Longitudinal section through the center of the pars neglecta. This and 9, from young Desmognathus fusca about 40 mm. long. Scale for 9 and 10, one hundredth mm. 13 to 18. Reconstructions of ears of larval salamanders, caudal views, somewhat diagramatic, especially 18. Dorsal side up, mesial side to the left. Lateral extensions in and 16 part of the utriculus. The more ventral or lower extension to the outside or to the right, begin- nings of the perilymphatic sac. 19. Triturus of 11 mm. 14. Amby- stoma maculatum about 13 mm. length. 15. A. Tigranum of 20 mm. Lateral lobe beginning of utriculus 16. A. maculatum of 15 mm. 17. Desmognathus fusca before hatching. Upper outgrowth utriculus, lower perilymphatic sac. 18. Triturus of 14 mm. lateral outgrowths of utriculus above, p
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